Thou blind Pharisee, cleanse first the inside of the cup and the platter, that the outside may be clean also (Matt. 23:26). And in Isaiah:

Wash you, make you clean, put away the evil of your works from before Mine eyes, cease to do evil; and then though your sins be as scarlet, they shall be as white as snow, though they have been red like crimson, they shall be as wool (Isa. 1:16, 18).